1661044037 has 2 divisors, whose sum is σ = 1661044038. Its totient is φ = 1661044036.

The previous prime is 1661044019. The next prime is 1661044067. The reversal of 1661044037 is 7304401661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 846169921 + 814874116 = 29089^2 + 28546^2 .

It is an emirp because it is prime and its reverse (7304401661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1661044037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1661043994 and 1661044012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1661044067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830522018 + 830522019.

It is an arithmetic number, because the mean of its divisors is an integer number (830522019).

Almost surely, 2^1661044037 is an apocalyptic number.

It is an amenable number.

1661044037 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661044037 is an equidigital number, since it uses as much as digits as its factorization.

1661044037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 1661044037 is about 40755.9080011721. The cubic root of 1661044037 is about 1184.2963264594.

Adding to 1661044037 its reverse (7304401661), we get a palindrome (8965445698).

The spelling of 1661044037 in words is "one billion, six hundred sixty-one million, forty-four thousand, thirty-seven".